Horseshoe-calk



'(No Model.)

A. H. ROWE. HORSESHOE UALK.

Patented Dec. 28, 1897.

ALLEN H. ROWVE, OF HARTFORD, CONNECTICUT.

'HORSESHOE-CALK.

SPECIFICATION forming part of Letters Patent No. 596,126, dated December28, 1897.

Application filed M81011 1 1396- To all whom it may concern:

Be it known that I, ALLEN H. ROWE, a citizen of the United States, and aresident of Hartford, in the county of Hartford and State threadedsocket is provided in the shoe and the calk is provided with athreadedportion fitting this socket. In the form of shoe-calk in which thethread on the shank terminates in the cylindrical body and no shoulderis provided on the calk to make close contact and fit tightly againstthe under surface of the calk itis quickly loosened in wear and dropsout. In the form of horseshoe-calks in which the threaded stem extendsupward from a shoulder it is necessary that the thread shall becontinued down closely against the shoulder and that the latter shouldbe left square and formed in a plane at right angles to the axis of thethreaded shank, so as to enable the proper bearing of the shoulderagainst the under face of the shoe to be obtained.

The object of my improvement is to provide a horseshoe-calk soconstructed as to completely obviate all difficulties not only in theuse but also in the practical manufacture of the horseshoe-calk and tosecure in my improved form the perfect operation of the calk.

To this end my invention consists in the details of the several featuresmaking up the calk and in their combination in the single structure, ashereinafter described, and more particularly pointed out in the claim.

Referring to the drawings, Figure 1 is a detail view, in side elevation,of the calk-blank partly formed. Fig. 2 is a detail top or plan view ofthis blank. Fig. 3 is a detail side view of the completed calk. Fig. 4is a detail view in cross-section through a horseshoe Serial No.583,598- (No model.)

and its threaded socket and showing my improved calk in place in thesocket.

In the manufacture of my improved calk I make use of a bar of metal ofthe proper angular shape in cross-section, preferably square, and havingwelded in and through the center of the bar a core of steel. From theend of this bar and by means of suitable tools the calks are out, thefirst operation being the turning down of the cylindrical shank b andthe making of a groove 0 around it and close against the square'shouldercl. For a limited distance the bar is left at its original shape to formthe base 6, preferably angular on its exterior, as shown, and the pointis then turned down to the shape of the cone f, the calk then being cutoff. On the shank b a thread is cut by means of a suitable tool, thethread running out where it reaches the groove, and the tops of thethreads extend beyond the bottom of the groove-that is, the shankmeasured through the threaded portion is of greater diameter than whenmeasured through the groove.

The completed calk is shown in Fig. 3 of the drawings, and such a calkis when screwed into the socket in a shoe readily turned in far enoughto secure a firm fitand close contact of the shoulder on the top of thebase against the under surface of the shoe, so that.

these parts act as a pinch-nut to hold the calk against rotary movement.The calk can neither be screwed farther into the socket nor,without theexercise of considerable force, unscrewed therefrom. Thorough experimentand use have determined the fact that the calk cannot be removed byaccident and ordinary wear in the ordinary use of the shoe.

In the finished calk the thread on the shank 6 runs out before itreaches the face of the shoulder 01 on account of the presence of thegroove 0 in the blank, the cutting edge of the die being able tocomplete the thread of full shape and height to the end of the run. In

cutting a thread on a shank which extends 5 from the fiat surface theface of the die strikes the shoulder before the thread is finished, andif the thread-cutting be continued the edge of the die cuts away thisshoulder or bevels it, so that in the absence of the groove the threadis left unfinished at the inner end of the shank or else the shoulder isbeveled so as to prevent its having the proper bearing.

By means of my improvement a horseshoecalk possesses all of the requiredfeatures which enable the complete thread to be formed along the shankand a square shoulder left to form a tight and uniform bearing over theunder surface of the shoe adjacent to the threaded socket.

I claim as my invention As an improved article of manufacture, theherein-described horseshoe-calk, the same comprising a solid base aangular on its exset forth.

ALLEN I-I. ROWE. lVitnesses:

ARTHUR BJENKINS, J. STERN.

